Q1. Connective tissues, although quite diverse in structure and location, do share a common theme: the connection between other types of tissues. Although all of the following seem to fit that criterion, one of the tissues listed is not a type of connective tissue. Which one?
Correct Answer: (b)
Muscle is one of the four primary tissue types (epithelial, connective, muscle, and nervous). While connective tissues like blood, adipose (fat), and cartilage connect or support organs, muscle is a distinct category specialized for contraction.
Q2. The three types of muscle all share
Correct Answer: (c)
While they differ in appearance (striated vs. smooth) and control (voluntary vs. involuntary), the fundamental functional characteristic shared by skeletal, cardiac, and smooth muscle is the ability to shorten or contract to produce force.
Q3. Ectotherms
Correct Answer: (c)
Ectotherms rely on external heat sources rather than internal metabolism to determine their body temperature. While they do not produce significant metabolic heat for regulation, they effectively regulate their temperature through behaviors such as basking in the sun or seeking shade.
Q4. Suppose that an alien virus arrives on Earth. This virus causes damage to the nervous system by attacking the structures of neurons. Which of the following structures would be immune from attack?
Correct Answer: (c)
Axons and dendrites are integral parts of a neuron's structure. Neuroglia (glial cells) are a separate class of cells in the nervous system that support neurons. If the virus specifically targets neuron structures, the neuroglia would remain unaffected.
Q5. Which of the following scenarios correctly describes positive feedback?
Correct Answer: (a)
Positive feedback occurs when a change in a variable triggers a response that intensifies or reinforces that change. If a furnace adds heat when the room is already getting hotter, it is pushing the system further away from the set point, which is a hallmark of positive feedback.
Q6. The function of neuroglia is to
Correct Answer: (b)
Neuroglia, or glial cells, do not conduct electrical impulses like neurons. Instead, they provide a support system for neurons, including insulation (myelin), nutrient delivery, and waste removal.
Q7. Rheumatoid arthritis is an autoimmune disease that attacks the linings of joints within the body. The cells that line these joints, and whose destruction causes the symptoms of arthritis, are known as
Correct Answer: (c)
Chondrocytes are the specialized cells found in cartilage. Rheumatoid arthritis involves the immune system attacking the joint capsule and the cartilage (containing chondrocytes) that cushions the ends of the bones.
Q8. Connective tissues include a diverse group of cells, yet they all share
Correct Answer: (d)
Connective tissues are characterized by having relatively few cells dispersed within an abundant extracellular matrix, which consists of protein fibers and a ground substance. This matrix determines the physical properties of the tissue.
Q9. Skeletal muscle cells differ from the “typical” mammalian cell in that they
Correct Answer: (a)
Skeletal muscle fibers are unique because they are multinucleated. This occurs because each fiber forms from the fusion of many individual embryonic cells (myoblasts) during development.
Q10. What do all the organs of the body have in common?
Correct Answer: (b)
An organ is defined as a structure composed of two or more different types of primary tissues (such as epithelial, connective, muscle, and nervous tissue) that work together to perform specific functions.
Q11. Epithelial tissues do all of the following except
Correct Answer: (c)
Epithelial tissues are primarily involved in protection, absorption, and gas exchange. The transmission of information in the central nervous system is the specialized function of nervous tissue, specifically neurons.
Q12. Examples of smooth muscle sites include
Correct Answer: (d)
Smooth muscle is found in the walls of hollow organs and structures. It controls the diameter of blood vessels, regulates the size of the pupil in the iris, and powers peristalsis in the digestive tract.
Q13. Skeletal muscle cells are
Correct Answer: (b)
During embryonic development, individual cells called myoblasts fuse together to form a single, long muscle fiber. This process results in the characteristic multinucleated state of skeletal muscle.
Q14. Homeostasis
Correct Answer: (d)
Homeostasis is the essential, dynamic process by which living organisms maintain a relatively stable internal environment despite fluctuations in external conditions.
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